Motor Effect

avatar
Created by
ben

Cards (14)

  • What is produced when a current flows through a conducting wire?
    A magnetic field is produced around the wire.
  • What determines the strength of the magnetic field around a current-carrying wire?
    The magnitude of the current flowing through the wire
    The distance from the wire.
  • What is a solenoid? 
    A coil of wire which when current passes through creates a strong magnetic field. 
  • Describe the magnetic field found inside a solenoid.    
    Strong and uniform. 
  • What is an electromagnet?
    A solenoid with an iron core
    Adding the iron core increases the strength of the magnetic field.     
  • What is the motor effect? (Higher)
    When a force is exerted between a magnetic field and a current-carrying conductor placed in that field.
  • What rule is used to determine the force experienced due to the motor effect? (Higher)
    Fleming's Left-Hand Rule
  • When using Fleming's Left Hand rule what does forefinger represent? (Higher)
    The forefinger points in the direction of the magnetic field.
  • When using Fleming's left hand rule what does the second finger represent? 
    The second finger points in the direction of current flow in the conductor. 
  • What factors affect the size of the force on a current-carrying wire in a magnetic field? (Higher) 
    The magnitude of the current flowing through the conductor
    The strength of the magnetic field that the conductor is placed in. 
  • What criteria must be met for the equation linking force, magnetic influx density, current and length to hold?
    The conductor must be at right-angles to the magnetic field it is placed in.
  • What unit is used for magnetic flux density?
    Tesla (T)
  • How does an electric motor work? (Higher)
    A coil of wire, carrying current, is placed in a magnetic field
    The forces on both sides perpendicular to the field experience forced in opposite directions
    This causes a rotational effect   
  • How do loud speakers make use of the motor effect? 
    The motor effect is used to convert variations in the current of an electrical circuit into the pressure variations which produce an audible sound.